Python pandas学习

#


import numpy as np
import pandas as pd
dataPath = r'D:\\\\data.csv'

df =pd.read_csv(dataPath)



# 任务1:绘制按月份的销售额
columnName = r'1、请选择:日期'
r = df.sort_values(by=columnName)# 这个就是我想要的排序算法



print("hello")

type(df)
df.head()

index = df.index
columns = df.columns

type(columns)

type(index)

r = df.to_numpy()

dataList = r[:,6]
d =dataList[0]
type(d)




# 拿到日期。 list ,以及对应的key值?第6列

# dateList = data.

sdf = df.sort_value(axis = 6, ascending=True)
sdf = df.sort_value(axis = 8, ascending=True)

df[0:3]
df[0:0]
print()




# 查看一个元素的值?

list = df['1、请选择日期:出货日期']#这个方式可以的

list1 =  df.loc[dates[0]]
list2 =  df.iloc[:,5:5]


ddd = df.iloc[5, 6]
type(ddd)

n = 6
r = df.iloc[:,n:n+1]

rs = r




sdf = df.sort_value('1、请选择日期:出货日期')



df = pd.DataFrame({
'one': pd.Series(np.random.randn(3), index=['a', 'b', 'c']),
'two': pd.Series(np.random.randn(4), index=['a', 'b', 'c', 'd']),
'three': pd.Series(np.random.randn(3), index=['b', 'c', 'd'])})


unsorted_df = df.reindex(index=['a', 'd', 'c', 'b'],
                         columns=['three', 'two', 'one'])

sorted_df = unsorted_df.sort_index(axis=1)#按照列的index进行排序
sorted_df = unsorted_df.sort_index(axis=0)#按照行的index进行排序


s1 = pd.DataFrame({"a": ['B', 'a', 'C'],"b": [1, 2, 3],"c": [2, 3, 4]}).set_index(list("ab"))

s1 = pd.DataFrame({"a": ['B', 'a', 'C'],"b": [1, 2, 3],"c": [2, 3, 4]})

s1c = pd.DataFrame({"a": ['B', 'a', 'C'],"b": [1, 2, 3],"c": [2, 3, 4]}).set_index(list("ab"))



df1 = pd.DataFrame({'one': [2, 1, 1, 1],
'two': [1, 3, 2, 4],
'three': [5, 4, 3, 2]})

df1.sort_values(by='two')# 这个就是我想要的排序算法


# 绘图画图(plot)
import matplotlib.pyplot as plt

# plot 函数怎么用

#任务2:
posted @ 2020-10-20 20:01  bH1pJ  阅读(26)  评论(0编辑  收藏  举报